A2 used to refer to a single person when you do not know who they are or when it is not important who they are某人
More examples
I could hear someone crying in the next room.
I need someone dependable to look after the children while I'm at work.
He was desperate to tell someone his good news.
I couldn't find the station, so I asked someone if they could direct me.
We could hear someone knocking at the door.
👨🏻🏫 Mr. Ng 劍橋詞典 📚 – cambridge.mister5️⃣.net
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